package com.pmt.feedplayer.ui

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import com.pmt.feedplayer.data.VideoItem
import com.pmt.feedplayer.translate.TranslationService
import com.pmt.feedplayer.translate.PlayerManager
import com.pmt.feedplayer.translate.AudioExtractor
import com.pmt.feedplayer.translate.SpeechRecognizer
import com.pmt.feedplayer.translate.TranslationController
import com.pmt.feedplayer.translate.TranslationListener
import kotlinx.coroutines.*
import kotlinx.cinterop.*
import platform.AVFoundation.*
import platform.CoreMedia.*
import platform.UIKit.*
import platform.Foundation.*
import androidx.compose.ui.viewinterop.UIKitView
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.flow

// iOS平台特定的AudioExtractor实现
class iOSAudioExtractor : AudioExtractor {
    override suspend fun extractAudio(videoUrl: String): Flow<ByteArray> {
        // iOS平台音频提取实现
        return flow {}
    }
    
    override fun stop() {
        // 停止实现
    }
    
    override fun setBufferSize(sizeInMs: Int) {
        // 设置缓冲区大小
    }
}

// iOS平台特定的SpeechRecognizer实现
class iOSSpeechRecognizer(private val context: NSObject) : SpeechRecognizer {
    private var recognitionTask: SFSpeechRecognitionTask? = null
    private val speechRecognizer = SFSpeechRecognizer(NSLocale("ja-JP"))
    private val audioEngine = AVAudioEngine()
    private val audioSession = AVAudioSession.sharedInstance()
    
    init {
        // 检查语音识别权限
        SFSpeechRecognizer.requestAuthorization { status ->
            when (status) {
                SFSpeechRecognizerAuthorizationStatusAuthorized -> {
                    println("语音识别权限已授权")
                }
                else -> {
                    println("语音识别权限未授权")
                }
            }
        }
    }
    
    override suspend fun recognize(audioData: ByteArray): String {
        return withContext(Dispatchers.Default) {
            // 简化版的语音识别实现
            // 实际实现需要使用SFSpeechRecognizer进行真正的语音识别
            "识别的日语文本"
        }
    }
    
    override fun setLanguage(languageCode: String) {
        // 设置识别语言
    }
    
    override fun getConfidence(): Float? {
        return null
    }
    
    override fun startRealtimeRecognition(onRecognitionResult: (String) -> Unit) {
        try {
            // 设置音频会话
            val errorPtr = alloc<ObjCObjectVar<NSError?>>()
            audioSession.setCategory(AVAudioSessionCategoryRecord, error = errorPtr.ptr)
            audioSession.setActive(true, error = errorPtr.ptr)
            
            val inputNode = audioEngine.inputNode
            val recordingFormat = inputNode.outputFormatForBus(0)
            
            inputNode.installTapOnBus(
                bus = 0,
                bufferSize = 1024uL,
                format = recordingFormat
            ) { buffer, time ->
                // 这里可以处理音频缓冲区并进行语音识别
                // 简化实现，实际应使用SFSpeechAudioBufferRecognitionRequest
                println("录音中...")
            }
            
            audioEngine.prepare()
            audioEngine.startAndReturnError(errorPtr.ptr)
            
        } catch (e: Exception) {
            println("启动实时语音识别失败: ${e.message}")
        }
    }
    
    override fun stopRealtimeRecognition() {
        audioEngine.stop()
        audioEngine.inputNode.removeTapOnBus(0)
        recognitionTask?.cancel()
    }
}

// iOS平台特定的TranslationService实现
class iOSTranslationService : TranslationService {
    // 使用iOS的MLKit或其他翻译服务
    override suspend fun translate(text: String, sourceLanguage: String, targetLanguage: String): String {
        // 简化实现，实际应使用MLKit或其他翻译API
        return "翻译后的中文文本"
    }
}

// iOS平台特定的Translator实现
class iOSTranslationService : Translator {
    override suspend fun translate(text: String, sourceLang: String, targetLang: String): String {
        // 简化版的翻译实现
        // 实际实现需要使用iOS的翻译API
        return "翻译结果: $text"
    }
    
    override suspend fun batchTranslate(texts: List<String>, sourceLang: String, targetLang: String): List<String> {
        return texts.map { translate(it, sourceLang, targetLang) }
    }
    
    override fun stop() {
        // 停止实现
    }
}

// iOS平台特定的SubtitleManager实现
class iOSSubtitleManager : SubtitleManager {
    private val _translationResults = MutableSharedFlow<TranslationResult>()
    private var subtitleDelay: Long = 0
    
    override fun addTranslationResult(result: TranslationResult) {
        // 立即发送结果
        _translationResults.tryEmit(result)
    }
    
    override fun getCurrentSubtitle(currentTime: Long): TranslationResult? {
        // 简化实现，实际应该返回当前时间对应的字幕
        return null
    }
    
    override fun setSubtitleDelay(delayMs: Long) {
        subtitleDelay = delayMs
    }
    
    override fun clearSubtitles() {
        // 清除实现
    }
    
    override val translationResults: Flow<TranslationResult>
        get() = _translationResults
}

@Composable
actual fun VideoPlayerScreen(videoItem: VideoItem, onBack: () -> Unit) {
    val coroutineScope = rememberCoroutineScope()
    val playerManager = PlayerManager.getInstance()
    
    // 状态管理
    var isPlaying by remember { mutableStateOf(false) }
    var currentTranslation by remember { mutableStateOf("正在准备翻译...") }
    var translationHistory by remember { mutableStateOf(listOf<String>()) }
    var isTranslationEnabled by remember { mutableStateOf(true) }
    
    // 创建翻译控制器
    val translationController = remember {
        TranslationController(
            audioExtractor = iOSAudioExtractor(),
            speechRecognizer = iOSSpeechRecognizer(NSObject()),
            translator = iOSTranslationService(),
            subtitleManager = iOSSubtitleManager(),
            scope = coroutineScope
        )
    }
    
    // 设置翻译监听器
    val translationListener = remember {
        object : TranslationListener {
            override fun onTranslationResult(originalText: String, translatedText: String) {
                currentTranslation = translatedText
                translationHistory = listOf("$originalText -> $translatedText") + translationHistory.take(9)
            }
            
            override fun onError(error: String) {
                currentTranslation = "翻译出错: $error"
            }
        }
    }
    
    // 初始化播放器和翻译服务
    LaunchedEffect(videoItem) {
        playerManager.loadVideo(videoItem.uri)
        translationController.setTranslationListener(translationListener)
        
        if (isTranslationEnabled) {
            translationController.startTranslation()
        }
    }
    
    // 清理资源
    DisposableEffect(Unit) {
        onDispose {
            translationController.stopTranslation()
            playerManager.release()
        }
    }
    
    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text("视频播放器") },
                navigationIcon = {
                    IconButton(onClick = onBack) {
                        Icon(Icons.Default.ArrowBack, contentDescription = "返回")
                    }
                }
            )
        }
    ) {\ padding ->
        Box(modifier = Modifier.fillMaxSize().padding(padding)) {
            // iOS视频播放视图
            UIKitView(
                factory = { context ->
                    val playerLayer = AVPlayerLayer()
                    val playerView = UIView()
                    
                    playerLayer.player = playerManager.getAVPlayer()
                    playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
                    playerView.layer.addSublayer(playerLayer)
                    
                    // 监听播放器状态变化
                    val statusObservation = playerManager.getAVPlayer()?.addObserver(
                        forKeyPath = "status",
                        options = NSKeyValueObservingOptionNew,
                        context = null
                    ) { keyPath, object, change, context ->
                        if (keyPath == "status" && object is AVPlayer) {
                            if (object.status == AVPlayerStatusReadyToPlay) {
                                object.play()
                                isPlaying = true
                            }
                        }
                    }
                    
                    playerView
                },
                modifier = Modifier.fillMaxWidth().aspectRatio(16f / 9f)
            )
            
            // 字幕显示区域
            if (isTranslationEnabled && currentTranslation.isNotEmpty()) {
                SubtitleView(
                    subtitle = currentTranslation,
                    modifier = Modifier
                        .align(Alignment.BottomCenter)
                        .padding(horizontal = 16.dp, vertical = 8.dp)
                )
            }
            
            // 翻译控制面板
            TranslationControlPanel(
                isTranslationEnabled = isTranslationEnabled,
                onTranslationToggle = {
                    isTranslationEnabled = it
                    if (it) {
                        translationController.startTranslation()
                    } else {
                        translationController.stopTranslation()
                    }
                },
                modifier = Modifier
                    .align(Alignment.TopEnd)
                    .padding(16.dp)
            )
            
            // 翻译历史
            if (translationHistory.isNotEmpty()) {
                SubtitleHistoryView(
                    history = translationHistory,
                    modifier = Modifier
                        .align(Alignment.BottomEnd)
                        .padding(16.dp)
                )
            }
            
            // 播放控制
            Box(
                modifier = Modifier
                    .align(Alignment.Center)
                    .background(Color.Black.copy(alpha = 0.3f))
                    .padding(8.dp)
            ) {
                IconButton(
                    onClick = {
                        if (isPlaying) {
                            playerManager.pause()
                        } else {
                            playerManager.play()
                        }
                        isPlaying = !isPlaying
                    }
                ) {
                    Icon(
                        imageVector = if (isPlaying) Icons.Default.Pause else Icons.Default.PlayArrow,
                        contentDescription = if (isPlaying) "暂停" else "播放",
                        tint = Color.White,
                        modifier = Modifier.size(48.dp)
                    )
                }
            }
        }
    }
}